Suppose a sample of n = 50 items is drawn from a population of manufactured products and the weight, X, of each item is recorded. Prior experience has shown that the weight has a probability distribution with mean 6 ounces and standard deviation 2.5 ounces. Which of the following is true about the sampling distribution of the sample mean if a sample of size 15 is selected？
A、The mean of the sampling distribution is 6 ounces.;
B、The standard deviation of the sampling distribution is 2.5 ounces.;
C、The shape of the sample distribution is approximately normal.;
D、None.
发布时间：2025-07-25 09:36:14
